LINCOLN TOWN CAR FUEL PRESSURE PROBLEM

1988 Lincoln Town Car • 15,000 miles

AROUND 42 MILES PER HR IT WILL START TO SHUDDER AN SHAKE BADLY
TRANNY SHOP SAYS IT IS FUEL NOT TRANNY. HAVE REPLACED EVERYTHING FROM COIL TO INJECTORS.
IT WILL CHANGE SPEED OF IDLE AT REST AN SURGE ALSO